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(No Model.) 3 Sheets8heet 1.

J.T.GREENE. FURNACE.

No. 581,347. Patented Apr. 27, 1897.

(No Model.) Q 3 SheetsSheet-2. J. T. GREENE.

FURNAGE. No. 581,347. Patented Apr. 27, 1897.

NDRBIS PEVERS co. wow-141ml, wrsmuarom a c (No Model.) 3 Sheets-Sheet 3.

J. T. GREENE.

FURNACE Patented Apr. 27

, jzycizr :7 4AM 6W [an 1.9L 50 UNITED STATES PATENT @FFICE.

JESSE T. GREENE, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-TENTH TO AUGUSTUS RUFFNER, OF SAME PLACE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 581 ,347, dated April 27, 1897.

Application filed September 10, 1894:. Renewed October 1, 1896. Serial No. 607,614. (No model.)

the process of combustion and the free generation and concentration of the heat-gases, whereby a better and more economical result is obtained thanhas been possible under the ordinary arrangements.

In the drawings, Figure 1 is a front elevation, Fig. 2 a vertical transverse section, and Fig. 3 a vertical longitudinal section,of a furnace embodying my improved features.

A is a frame or boiler front; A, the inclosing side walls; A the front end wall; A the rear or back end wall; A the top or roof: B, the combustion-chamber, and B the fuelchamber.

A hollow cylinder or body C is located in and extends longitudinally through the combustion-chamber, the respective ends thereof being supported in the front and back walls, as shown in Fig. 3. This body is closed at the front end and open at the rear or discharge end. This cylindrical body C partly separates or divides the combustion-chamber from the fuel-chamber, leaving the communicating passages or spaces a, Fig. 2, at each side between the exterior heat-collecting cylinder and the inclined grate-bars D for the fuel to pass or gravitate into the combustion-chamber.

The cylinder C is provided in the sides with a number of openings a, disposed at intervals, and in the under side with the longitudinal openings a extending from end to end. This continuous opening forms a passage for the heated air to enter the cylinder or chambered body, and also provides for the escape of any particles of fuel and ashes that may pass in through the openings in the sides. The heat-collecting cylinder'will ordinarily be composed of fire-clay and the same principle of construction employed as that followed in the manufacture of retorts of the same material.

One of the particular advantagesis that the fuel surrounding the cylinder is always in an incandescent state, so that the heated air entering therein and conducted therethrough is of a very high temperature and uniformly continuous, so that no cold air from the ash-pit enters and commingles therewith, thus being productive of the best possible results.

Under the ordinary furnace arrangement the conditions are such that there are portions of the grate-bars not covered with fuel, leaving openings for the admission of atmospheric air which mingles with and lowers the temperature of the heated air discharged from the combustion-chamber. Neither can the process of combustion be as perfect nor as economical as that of the furnace shown.

The arrows below the grate-bars and in the .various openings and passing out through the rear open end, as illustrated in Fig. 3.

The cylindrical chambered body C receives and concentrates the heat-gases as they are generated and continues and promotes the complete and final decomposition and combustion of such as are inflammable and still unconsumed and then discharges them through the open end on their way to the point of practical application. I

The series of inclined grate-bars present on their front side a surface that is slightly concave, so as to conform somewhat to the spherical sides of the cylinder, whereby the fuel will be much less liable to clog or stick in the passages forming the com municationbetween the fuel and combustion chambers, thus insuring a continuous and uniform feed.

The upper ends of the inclined grate-bars are movably secured in place by two bars a and a number of bolts (0 extending through the inclosing side walls. The lower ends of these grate-bars, Fig. 2, are provided with a notch 19, engaging with a rib Z), formed on the longitudinal horizontal bars 12 b are supported loosely on the stationary plates E. The inner ends of a number of ad- The bars justing-rods cl are connected to the horizontal bars 12 These rods extend through the disk-walls, the outer ends extending through brackets 61 and being screw-threaded for the engagement of the locking-nu ts (1 (F, as shown in Fig. 2. By this means the inclination of the grate-bars may be varied, and the fuelpassage between the bars and cylinder widened or narrowed, as the character of the fuel or other circumstances require, for the base 11 may be readily moved in or out and set at any desired point through the medium of the rods (1.

The rocking grate-bars F are located in the contracted space between the stationary plates E, so that when these bars are dumped to discharge the accumulation of ashes but a small surface is agitated and the uniform feed of the fuel not varied.

The f uelchamber is ordinarily charged from the top, the fuel gradually gravitating into the passages leading to the combustionchamber, whereby the process of combustion is continuous with the best possible results, as all the heat-producing power of the fuel is extracted and no gases liberated to escape into the atmosphere.

The doors G afford access to the f uel-chamber. The smaller doors 9 open in at a point opposite the passage leading from the fuel in the combustion-chamber.

II represents the usual furnace-doors, and h the doors opening into the ash-pit.

It will be understood that the heat-collecting cylinder maybe constructed of any material other than fire-clay that is found to be the most suitable for the purpose. Neither will the cylindrical form be strictly adhered to, as it is obvious that it may be of any desired shape inv cross-section.

The side openings in the heat-collecting body may be omitted and the entire volume of heat-gases made to enter through the opening in the bottom. This will be governed by the particular application, as, in some instances the side openings will be necessary, while in other instances they may be entirely dispensed with. Neither do I confine or limit myself to the precise construction and general arrangement shown, but may make such changes as ordinarily come within the scope of the skilled mechanic or that the particular practical application may require without departing from the spirit of my invention.

Having thus described myinvention, what I claim, and desire to secure by Letters Patent, is-

1. In a furnace, the combination with a combustion-chamber, of a heat-collecting cylinder,extending longitudinally thereof and having a lengthwise draft-opening through its bottom.

2. In a furnace, the combination with fuel and combustion chambers, located in different horizontal planes, of a heat-collectin g cylinder, located in and partly dividing said chambers. I

3. In a furnace, the combination with fuel and combustion chambers, of a heat-collectin g cylinder, having an opening in the bottom thereof, and inclined grate-bars, leading from the f uel-chamber to the combustion-chamber, past and adjacent to the sides of the cylinder.

4. In a furnace, the combination with fuel and combustion chambers, of a heat-collecting cylinder, having openings in the sides, and inclined grate-bars, leading past and adjacent to the sides of the cylinder.

5. In a furnace, the combination with fuel and combustion chambers, of a heat-collecting cylinder, having perforated sides and a lengthwise opening in the bottom, and inclined grate-bars, leading from the fuel to the combustion chamber past and adjacent to the sides of the cylinder.

6. In afurnace, the combination with a fuel and combustion chamber, of a heat-collectin g cylinder, extending longitudinally therethrough and providing a space on each side thereof for the passage of the fuel downwardly into the combustion-chamber, the body of the fuel resting above said cylinder, which is provided with an opening in the under side ex tending from end to end and having openings in the respective sides, the heat entering said cylin der through the respective openings, and being discharged therefrom at the rear end, substantially as set forth.

7. In a furnace the combination with, a fuelchamber and a combustion-chamber common to each other, of a heat-collecting cylinder inserted longitudinally therethrough and havin g openings therein, the inclined grate-bars located at each side of said cylinder and leaving narrowed passages between said fuel and combustion chambers, substantially as set forth.

8. In a furnace the combination with a combustion-chamber and fuel-chamber common to each other, of a heat-collecting cylinder, inserted longitudinally therethrough and partly dividing said chambers, the inclined gratebars, and the horizontal rocking bars, substantially as set forth.

9. In a furnace the combination with, the heat collecting cylinder, having openings therein, of the series of inclined grate-bars, the longitudinal bars, supporting the lower ends of the inclined grate-bars, the stationary angle-plates, and the adjusting-rods, secured at their inner ends to said longitudinal bars, whereby the inclined grate-bars may be adjusted to widen or narrow the passages between the fuel and combustion chambers, substantially as set forth.

JESSE T. GREENE.

\Vitnesses:

L. M. FREEMAN, L. B. COUPLAND. 

